Once the data is inserted, the script redirects the user back to the index.php page, where they can see their comment or reply. It retrieves the name, email, and comment data from the form, as well as the parent_id field if the comment is a reply. When a user submits a comment or reply, the post-comment.php script executes and inserts the data into the comments table of our database. We also added a link to each comment called "Reply," which takes the user to a reply form where they can submit their reply. This allows us to display nested replies under their parent comment. If a comment has replies, the function calls itself recursively with the ID of the comment as a parameter. It starts by retrieving all top-level comments (i.e., those with a parent_id of 0), then displays each comment with its corresponding replies. The display_comments() function that we created is a recursive function that retrieves all comments and replies from the database and displays them on the page. Once the form is submitted, the post-comment.php script will execute and insert the comment data into the database. The form also has a submit button that lets the user submit their comment. It has an action attribute set to post-comment.php, which is the script that will handle the form data and post it to the database. Our comment form is a simple HTML form that collects the user's name, email, and comment. This will let us display the comments and replies in chronological order. In addition to the comment data, we also added a created_at column with the timestamp of when the comment was created. This approach allows us to build a hierarchical structure for storing comments and replies. Otherwise, it's set to the ID of the parent comment. If the comment is a top-level comment, then its parent_id is set to 0. The parent_id is an integer that represents the comment to which a reply belongs. In our schema, we had one table called comments with columns for id, parent_id, name, email, comment, and created_at. Having a well-structured database schema is crucial for any comment and reply system. Let's dive deeper into the topics we covered in the previous article. For example, you could add user authentication and authorization, implement pagination, and add comment moderation features. While this tutorial is a good starting point, there are many ways to improve it. We've covered everything from database schema to displaying comments and replies on the page. In this tutorial, we've looked at how you can create a comment and reply system using PHP and MySQL. This code is very similar to the original comment form, except we've added a hidden field that sets the parent_id to the ID of the comment being replied to. In the display_comments() function earlier, we included a link called "Reply." This link takes the user to a reply.php page, where they can post a reply to a specific comment. Otherwise, it will be 0.įinally, the script redirects the user back to the index.php page, where they can see their comment or reply. If the comment is a reply, the parent_id field will be set to the ID of the parent comment. It then inserts the data into the comments table of our MySQL database. This script retrieves the name, email, and comment data that was posted from the form. Now that we have our display and form, let's create the PHP script that will post the comment or reply to the database. This is not best practice, but we're keeping things simple for this tutorial. Note that we're using a global PDO instance to connect to the database. We're using a recursive function to handle the nested comments. It then displays each comment and corresponding replies on the page. This script connects to our MySQL database and retrieves all the top-level comments (i.e., those with a parent_id of 0) and their replies. $comments = $stmt -> fetchAll(PDO :: FETCH_ASSOC) ĭisplay_comments( $comment, $margin_left + 20) Let's start by creating a form that allows users to post comments. Now that we have our database table created, we can start building our website. The parent_id column will allow us to associate replies with their corresponding comments. This schema will allow us to store comments and replies in a hierarchical fashion. created_at – The timestamp of when the comment was created.email – The email address of the commenter.A top-level comment has its parent_id set to 0. parent_id – An integer that represents the comment to which this reply belongs.id – An auto-incrementing integer that serves as the primary key.CREATE TABLE comments ( id INT NOT NULL AUTO_INCREMENT, parent_id INT, name VARCHAR( 100) NOT NULL, email VARCHAR( 100) NOT NULL, comment TEXT NOT NULL, created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP, PRIMARY KEY (id)
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